MPMusicPlayerController doesn't finish preparing to play
Originator: | jay.whitsitt | ||
Number: | rdar://35544822 | Date Originated: | November 14 2017 |
Status: | Open | Resolved: | |
Product: | iOS + SDK | Product Version: | MusicKit on iOS |
Classification: | Bug | Reproducible: | Sometimes |
Summary: On iOS 11.1, when using an instance of MPMusicPlayerController, it sometimes won't call the completionHandler sent to prepareToPlayWithCompletionHandler: or set isPreparedToPlay to YES. This doesn't seem to affect one instance of MPMusicPlayerController more than the others. This has been reproduced using systemMusicPlayer, applicationMusicPlayer, and applicationQueuePlayer. When this happens, calling [player play] produces unstable results. Sometimes it plays. Sometimes it doesn't. Sometimes it plays an unexpected song, typically the last played song. The sysdiagnose is attached. The issue was reproduced between 15:32 and 15:33. I've also attached a sample app that can reproduce this. When tapping the play button, it doesn't always play. Steps to Reproduce: 1. Get an instance of MPMusicPlayerController (e.g., systemMusicPlayer) 2. Queue a song ([player setQueueWithStoreIDs:@[@"295757262"]];) 3. Prepare to play it ([player prepareToPlayWithCompletionHandler:block];) Expected Results: isPreparedToPlay == YES after a short period and the given completionHandler is called. Actual Results: isPreparedToPlay == NO indefinitely and the given completionHandler is not called. Version/Build: iOS 11.1 and 11.1.0 Configuration: iPhone X, iPhone 6 Plus
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